Numerical study for predicting tensile damage progress in CFRP laminates with initial fiber cracks

Shigeki Yashiro, Keiji Ogi, Tetsuro Shiraishi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study investigates the damage progress in CFRP cross-ply laminates with initial fiber cracks, introduced in the fabrication process of composite structures by the use of chopped strands or cutting preforms. The fiber cracks will induce complex damage process and also become the source of the final fracture. Tensile tests were conducted for the coupon specimens with fiber cracks, and the damage progress in these specimens was observed by the soft X-ray radiography. We then evaluated the damage process in the laminate with fiber cracks by the layer-wise finite-element model with cohesive elements. The simulated damage patterns included the matrix cracks along the initial fiber cracks, splits in the 0° layer extending from the tips of the fiber cracks, and transverse cracks in the 90° layer. Delamination was also generated at the crossing point of ply cracks due to the large shear stress, and then extended in the triangular region bounded by the fiber cracks and splits. Furthermore, the damage state at the final failure was obtained in the damage analysis by applying a conventional damage criterion to the fiber breakages. The predicted damage extension to the final failure agreed with the observations. The numerical results also demonstrated that the damage near the initial fiber cracks produced a similar stress field to a penetrating notch.

Original languageEnglish
Title of host publicationProgress of Composites 2008 in Asia and Australasia - Proceedings of the 6th Asian-Australasian Conference on Composite Materials, ACCM 2008
Pages379-382
Number of pages4
Publication statusPublished - 2008
Externally publishedYes
Event6th Asian-Australasian Conference on Composite Materials: Progress of Composites 2008 in Asia and Australasia, ACCM 2008 - Kumamoto, Kyushu, Japan
Duration: Sep 23 2008Sep 26 2008

Other

Other6th Asian-Australasian Conference on Composite Materials: Progress of Composites 2008 in Asia and Australasia, ACCM 2008
CountryJapan
CityKumamoto, Kyushu
Period9/23/089/26/08

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

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    Yashiro, S., Ogi, K., & Shiraishi, T. (2008). Numerical study for predicting tensile damage progress in CFRP laminates with initial fiber cracks. In Progress of Composites 2008 in Asia and Australasia - Proceedings of the 6th Asian-Australasian Conference on Composite Materials, ACCM 2008 (pp. 379-382)